Lvming Zhang, Zhao Dong, Huidan Fu and Shengyuan Yu
A 52-year-old man with a history of diabetes mellitus presented with acute horizontal diplopia and transient vertigo for 6 days. Neurologic examination revealed isolated left abducent limitation and right positive Babinski sign with no limbs weakness. The rest of his extraocular movements were normal, and no nystagmus or internuclear ophthalmoplegia was observed. He did not have additional pontomedullary symptoms or signs, such as facial palsy, sensory loss, dysarthria or weakness.
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